Orbital Gearbox - Prototype reduction drive
Print Profile(2)
Description
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Orbital Gearbox
A prototype gearbox design that combines planetary and strain wave gearing to create a multi-material 3D printed reduction drive that is compact while providing very high gear ratios for high torque applications.
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Features
- High positional accuracy with virtually zero backlash
- Two-speed compound gearbox design
- Capable of being driven by either the sun gear or planet carrier
- Modular design made for 3D printing and easy assembly
- Quickly experiment with new materials and processes
- Custom print profile and STEP files for accurate functional prints
- Build plates separated by component and material capability
Specifications
- Planetary gearing with ratio of 4:1
- 32 tooth sun gear, planet gears offset by +/- 2 teeth
- Strain wave gearing with ratio of 40:1
- 80 tooth flex spline, 82 tooth ring gear
- 2 mm flex spline wall thickness
- Integrated 2 degree planetary gear bevel allows flex spline to bend more naturally
- Outer dimensions: 74 mm x 100 mm x 100 mm
- Housing can be mounted with eight M3 screws (49mm radius)
| Component | Gear Ratio | Driver or Mounting |
| Input | Sun gear | 160:1 | 6 mm hex |
| Input | Planet carrier | 40:1 | four M3 screws (r = 16mm) |
| Output | Flex spline (cap) | n/a | six M3 screws (r = 17.5mm) |
| Output | Flex spline (through-bolt) | n/a | six M3 screws (r = 24mm) |
Assembly
Printed Parts
- Planetary Gears
- SunGear.step (1x)
- SunGearPost.step (1x)
- MajorPlanetGear.step (2x)
- MinorPlanetGear.step (2x)
- CarrierFront.step (1x)
- CarrierBack.step (1x)
- CarrierSpacerFront.step (1x)
- CarrierSpacerBack.step (1x)
- Flex spline
- FlexSpline.step (1x)
- FlexSplineCore.step (1x)
- FlexSplineCap.step (1x)
- Housing
- HousingBody.step (1x)
- HousingCover.step (1x)
Hardware
- M3x16mm Socket Head Cap Screw (1 pcs)
- M3x20mm Socket Head Cap Screw (6 pcs)
- M3x35mm Socket Head Cap Screw (12 pcs)
- MR106-2RS Deep Groove Ball Bearings 6mm x 10mm x 3mm (8 pcs)
- 608-2RS Ball Bearings 8mm x 22mm x 7mm (2 pcs)
- 6806-2RS Deep Groove Ball Bearings 30mm x 42mm x 7mm (1 pcs)
- 6812-2RS Deep Groove Ball Bearings 60mm x 78mm x 10mm (2 pcs)
Instructions
License
You shall not share, sub-license, sell, rent, host, transfer, or distribute in any way the digital or 3D printed versions of this object, nor any other derivative work of this object in its digital or physical format (including - but not limited to - remixes of this object, and hosting on other digital platforms). The objects may not be used without permission in any way whatsoever in which you charge money, or collect fees.
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